Major Changes:
- Add PyInfoTable wrapper class with from_bytes() static method for raw InfoTable decoding
- Expose InfoTable.from_bytes() from upstream alwayson-codec crate
- Add methods: get_row_count(), get_field_count(), get_datashape_name(), to_json()
- Export InfoTable class in Python module

Documentation Updates:
- Update README with InfoTable usage examples showing from_bytes() functionality
- Add note explaining underlying Rust crates are not yet open source
- Clarify library is delivered as pre-compiled binary wheels only
- Update quick start examples with comprehensive InfoTable demonstrations

Version Bump:
- Bump version to 0.4.0 across Cargo.toml, pyproject.toml, and lib.rs

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Co-Authored-By: Claude <noreply@anthropic.com>